Flap-valve.



PATENTED JULY 80, 1907.

E. WIKI.

FLAP VALVE.

APPLICATION FILED MAR. 7, 1907.

UNITED STATES PATENT OFFICE.

EDUARD WIKILOF LUCERNE, SWITZERLAND.

FLAP-VALVE.

Specification of Letters Patent.

Patented July 30, 1907.

Application filed-larch 7,1907. Serial No. 361,107.

larly to the construction of valtes such as are used in pumps of thecompressor or' blowing engine, vacuum or other types, in which a slidingvalve body, which maybe of the piston orflat seated type is providedwith ports which are moved into and out of register with ports of thevalve casing and the valve body has its ports provided with flap valves.

Theobject of my invention is the production of a simple and effectiveconstruction suitable for opera tion inhigh speed machinery and in whichthe'flap valves are made light so as to have little inertia and henceact quickly and are arranged to uncover the ports controlled by them asmuch as may be necessarywith a small amount of lift, the constructionbeing such that the flap valves require no 'backstops and the amount oflift may vary automatically with the conditions of service.

The various features of novelty which characterize my invention arepointed out with particularity in the claims annexed to and forming apart of this specification. For a better understanding of my invention,however, and the advantages possessed by it, reference may be had to theaccompanying drawings and descriptive matter in which I have illustratedand de-- scribed .iorms illwhich my invention may be embodied.

In the drawings, Figure 1 is a sectional elevation on the line 1-1 ofFig. .2, of a slide valve having ports controlled by my improved liftvalve, D. Fig. 2 is a side view of the valve shown in Fig. l with partof the flap valve removed. Figs. 3, 4 and 5 are plan views of thedifferent strips of resilient material of which the flap valves areconstructed. -Fig. 6 is the sectional elevation on the line 6ii of Fig.3. Fig. 7 is a sectional elevation on the line 77 of Fig. 4 Fig. is asectional elevation on the line 8-8 of Fig. 5. Fig. 9 is a view similarto Fig. 2, showing a modified form of my invention and Figs. 10, 11 and12 are plan views of the different flap valve strips employed in theconstruction shown in Fig. 9'. f

In the valve, construction shown in Figs; 1 to 8, A

represents a casing wall or seat having ports A and A which may lead tothe opposite cylinder ends of the compressing cylinder of the doubleacting blowing engine'or the like, andA represents an inlet port. Thesliding valve body 'B working on the upper face-oi the casing A has setsof outlet ports B and B The valve body is moved by the stem B to bringthe ports B and A and B and A alternately in and out of register. Whenthe ports B and A are in' register, the ports A are connected to theports A by a. passage B formed in the valve body B. Similarly when theports B and A register, the passage B connects the ports A and A.

Each of the ports B, which are arranged in a row, is placed end to endwith a corresponding port 13*, the

,ports B being arranged in a row similar to the ports B. The flap valvescontrolling each of the ports B and B eachcomprises a set of thin,narrow strips or fingers C, C and C formed of resilient material. Eachfinger O entirely covers the corresponding port B or B while the fingersC extend over only a portion of the length of the corresponding port,and the topmost finger C extends over only a shorter portion of thecorresponding port. In the form shown in Figs. 1 to 8 .inclusive, thefingers C, covering the ports in one half of the valve body, are allintegrally connected by abody portion 0 between the ports B and B andthe corresponding fingers C and C are similarly connected by bodyportion 0? and C. Registering apertures C formed in the body portions 0,C and C receive bolts D carried by the valve body and a clamping bar Dand nuts'D on the threaded outer ends of the bolts D are employed forclamping'the plates firmly against the portion of the alve body betweenthe ports B and B It will be understood that another and similar set offingers and clamping bar D are employed for the port shown as uncoveredin Fig. 2, though I may integrally connect all the fingers and employ asingle clamping bar.

In order to insure that the fingers C properly close the ports B and Bwhen the flap valve is in the closed position, I may advantageously bowinitially the outer plates as shown in Figs. 6 and-7, while making theinner plate flat, as shown in Fig. 8, so that in the closed positions ofthe fiap valve fingers each finger C is spring held against its seat.

In operation when the ports B, for instance, are moved into registerwith the. ports A and the pressure rises in the latter, thecorresponding flap valves lift and allow the passage of air through theports B. As the fingers are narrow, overlapping the ports but little,and fingers for adjacent ports are separated, a very slight lift issuflicient to make the escape passage between the fingers G and the topof the valve body cqual -to the area of the ports B. Furthermore, sisamount of lift depends upon the difference in pressure above and belowthe flap valves, thus automatically accom- Inodating itself to theconditions of service and as soon as the pressure above and below theflap valves is equalized, the valves close. By making the flap valves ofthis composite leaf spring form I am able to entirely dispense with therigid back bearings that it has heretofore been found necessary toemploy in valves of this general type to stop the lift of the flapvalves, and

, port and flap valve for-,said

against which the flap valves tend to knock themselves to pieces.

My improved flap valves are comparatively easy to construct and properlyassemble and the valves are capable of an automatic variation in'theamount of lift to accommodate the needs otuse'. I

In the construction shown in Figs. 9, 10, ll and l2, which I prefer onaccount of the simplicity over the construction shown in Figs. 1 to 8inclusive, the flap valvesfor each pair of end to end ports B and B areformed by three strips 0 0 and O which maybe rectangular in outline andcut from stock strips br'bars. Advantageously the strips 0 and 0" may;be'bowed as are the upper two plates in the construction s own in Figs'lto 8. The strips are held in position by guide'pins I) carried by thevalve body which pass through apertures 0 formed in the strips. Thevarious strips are clamped against the valve body by projecting oversaid port, the portions of said strips pro-- jecting over said portbeing of dilferent lengths, said portions of the outer strips beingshorter thanithe corresponding portions ot'the stripsless remote'fromthe valve body. j 2. In a valve for pumps, the combination with asliding valve body moving over a port or ports of the compressioncylinder, said body having tormedin it a narrow elongated portcomprising a thin.

narrow, elongated strip of resilient material extending over the 'portand one or'niore superposed similar strips;

each having a 'pprtion'wliich extends oversaidp'ort and ,is shorter thanthe correspondingportion 0t the strip immediately beneath it 3. In avalve for pumps, the (combination with a sliding -xvalve body movingover a port or ports ofiidie compressing:

- strips or fingers of'llght, thin,

cylinder, said body having fo'rined iniif'one or more sets of ports eachset'of ports comprising two'narrow' elongated pdrts placed end to end,ah'd flap valve'sfomprising two resilient material connected togetherfor each setnf ports, each flnge'r'entirely covering one ot-said twoports and one or more similar iingers super posed thereon and means forsecuring said resilient material against the body between the ports, thesuperposed strips'exten'dlng over a portion only of ports.

4. In a valve for pumps, the combination with a sliding valve'bodymoving over a port or ports of the compression 1 ports and one means forsecuring all of said strips against the body of ports and one orelongated ports placed senses cylinder, said body halving in it aplurality of narrow,

elongated ports arranged in two rows with one port of "each row in linewith the corresponding port of the other rowand flap valves for saidports narrow strip of resilient material for comprising a light, eachpair of alined or more similar superposed strips, and

the valve between the rows of ports, the superposed strips being eachshorter than the strip beneath it..

5. in a valve for pumps, the combination with a sliding valve bodymoving over a portorports of the compression cylinder, said body havingin it a plurality of narrow,

elongated ports, arranged in two rows with one port of each row in linewith the corresponding port of the other row and iiap valvesfor'saidports comprising a light, narrowstripot resilient matrialfor each pairof aiined securing all of said strips against the body'of the valvebetween the ,rows of ports; the superposed strips being each shorterthan th e strip beneath it, said'means including a clamping barextending between the rows of ports and means for drawing it] towardsaid valve body.

6. in a valve, a valve body, having a pair of narrow, end to end andflap valves for said ports comprising a set otjnarrow rectangular stripsof thin, resilient material superposed one above 'the' other and clampedagainst thevalve ends of the'por'ts with portionsjof-their free endspro-- more similar superposed strips, means'for body between theadjacent jecting over the ports,'thepro1ecting portions of the outerstrips being shorter the ,inner strips p 7. In combination a'valve'bodyhaving "two rows 0! nar row ports, each port being elongated in adir'ection transverse to, the direction of the rows/and than thecorresponding portions ot ,ports, comprising a light, narrow striporfinger of. resilient material for and extending over each port and oneorflnore superposed corresponding strips extending over a portion' onlyof the port, the extending portion of each of said superposed stripsbeing shorter than the corresponding portion of the strip beneath it,and means for securing all of said strips in place compyising a clampingbar extending between two rows of ports and means for drawing saidclamping bar toward gum valve body.

8. in combination a valve body having two rows of narrow. ports, eachport being elongated in-adirection transverseto the direction. ot'therows, and flap valves for-said ports, gzpmprisinga light, narrow stripor finger of ili eiit flap valve'for said 1 material for andextendingfover each port'and one or more I sifperposed strips entendingover a portion only of theport, theex'tending'portionot each of saidsuperposed strips being shorter than'tli'e corresponding portion of the'strip"benea'th 'it, and said,superposed strips being also initiallymade'cohcave toward the valve body, whereby the flap valves are normallyspring pressed against the valve body.

I I portal) with.

Witnesses Enw. Hanan, v

K an Human.

